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tar: report error if child dies while writing out the end of tarball

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(e.g. out of disk space).
This commit is contained in:
Denis Vlasenko 2006-12-17 19:08:20 +00:00
parent b131b271a0
commit c88894602d
1 changed files with 39 additions and 8 deletions
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47
archival/tar.c
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@ -504,7 +504,6 @@ static int writeTarFile(const int tar_fd, const int verboseFlag,
volatile int vfork_exec_errno = 0; volatile int vfork_exec_errno = 0;
char *zip_exec = (gzip == 1) ? "gzip" : "bzip2"; char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
if (pipe(gzipDataPipe) < 0 || pipe(gzipStatusPipe) < 0) if (pipe(gzipDataPipe) < 0 || pipe(gzipStatusPipe) < 0)
bb_perror_msg_and_die("pipe"); bb_perror_msg_and_die("pipe");
@ -585,10 +584,15 @@ static int writeTarFile(const int tar_fd, const int verboseFlag,
if (errorFlag) if (errorFlag)
bb_error_msg("error exit delayed from previous errors"); bb_error_msg("error exit delayed from previous errors");
if (gzipPid && waitpid(gzipPid, NULL, 0) == -1) if (gzipPid) {
bb_error_msg("waitpid failed"); int status;
if (waitpid(gzipPid, &status, 0) == -1)
return !errorFlag; bb_perror_msg("waitpid");
else if (!WIFEXITED(status) || WEXITSTATUS(status))
/* gzip was killed or has exited with nonzero! */
errorFlag = TRUE;
}
return errorFlag;
} }
#else #else
int writeTarFile(const int tar_fd, const int verboseFlag, int writeTarFile(const int tar_fd, const int verboseFlag,
@ -650,6 +654,29 @@ static char get_header_tar_Z(archive_handle_t *archive_handle)
#define get_header_tar_Z 0 #define get_header_tar_Z 0
#endif #endif
#ifdef CHECK_FOR_CHILD_EXITCODE
/* Looks like it isn't needed - tar detects malformed (truncated)
* archive if e.g. bunzip2 fails */
static int child_error;
static void handle_SIGCHLD(int status)
{
/* Actually, 'status' is a signo. We reuse it for other needs */
/* Wait for any child without blocking */
if (waitpid(-1, &status, WNOHANG) < 0)
/* wait failed?! I'm confused... */
return;
if (WIFEXITED(status) && WEXITSTATUS(status)==0)
/* child exited with 0 */
return;
/* Cannot happen?
if(!WIFSIGNALED(status) && !WIFEXITED(status)) return; */
child_error = 1;
}
#endif
enum { enum {
OPTBIT_KEEP_OLD = 7, OPTBIT_KEEP_OLD = 7,
USE_FEATURE_TAR_CREATE( OPTBIT_CREATE ,) USE_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
@ -862,6 +889,11 @@ int tar_main(int argc, char **argv)
if (base_dir) if (base_dir)
xchdir(base_dir); xchdir(base_dir);
#ifdef CHECK_FOR_CHILD_EXITCODE
/* We need to know whether child (gzip/bzip/etc) exits abnormally */
signal(SIGCHLD, handle_SIGCHLD);
#endif
/* create an archive */ /* create an archive */
if (opt & OPT_CREATE) { if (opt & OPT_CREATE) {
int zipMode = 0; int zipMode = 0;
@ -869,11 +901,10 @@ int tar_main(int argc, char **argv)
zipMode = 1; zipMode = 1;
if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2) if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2)
zipMode = 2; zipMode = 2;
writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE, /* NB: writeTarFile() closes tar_handle->src_fd */
return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE,
tar_handle->accept, tar_handle->accept,
tar_handle->reject, zipMode); tar_handle->reject, zipMode);
/* NB: writeTarFile() closes tar_handle->src_fd */
return EXIT_SUCCESS;
} }
while (get_header_ptr(tar_handle) == EXIT_SUCCESS) while (get_header_ptr(tar_handle) == EXIT_SUCCESS)